186 American Storms of December 1836. 
tent masters; leaving other risks of whatever class, to underwri- 
ters who are willing to rely on the classification of the vessels. 
American Storms of December 1836. 
From the 30th day of November to 21st December, 1836, six 
great cyclones passed successively over the United States; hav- 
ing passed New York on Nov. 30th,—Dec. 5th,—10th,—14th,— 
17th, and 2lst, respectively: under which, my barometer fell 
*62,—'35,—-44,—-86,— 90, and 1:05 in., in the several cases. 
The surrounding waves of exterior pressure’raised by their rota- 
tion, and separating each cyclone from the other, were indicated 
by my barometer as follows, viz.: Nov. 28th, 30:27; Dee. 4th, 
30:29 ;—S8th, 30:35 ;—12th, 30:28 ;—16th, 30-45 ;—19th, 30°80; 
and Dec. 22nd, 30°72 inches. Each cyclone exhibited here the 
ing the cyclonic centers to have passed far westward of New 
York, and over the Canadas, in their several routes to the north- 
ern regions of the Atlantic. 
In the last of these storms, which has been examined by Prof. 
Loomis,t+ the wind at New Orleans, on the 20th, blew hard from 
a southern quarter, and also on our Atlantic coast, during the lat- 
ter part of 20th and early part of 2Ist; veering westward. Al 
Rochester, N. Y., it blew from southeast on the afternoon of 
20th, with great power, and furiously at Buffalo, also veering 
round by the south to the west, during the night; thus showing 
that the axis of this gale passed northwardly at a distance much 
to the west of these places. This fact is confirmed, also, by the 
reports of winds as made to the Regents at Albany, and by those 
obtained from the military posts and other sources; very maby 
’ of which are given by Prof. Loomis. The same fact is shown 
by barometric observations as published by him. For although 
the central nuclens of the storm, or area of greatest barometric 
depression, passed the western observers during the night, whet 
the greatest and most rapid fall and rise of the barometer was not 
noted, yet, the depression as recorded proves to be greatest as we 
go towards the true center-path of the storm, as the same is ap 
proximately indicated on the Chart: marked xxvir. ‘This is see? 
in the observations made at Lexington, (K.) Springfield, (0.) 
Marietta, Twinsburg, Rochester, Syracuse, Albany, Montreal, 
Hanover, and Quebec ; which, even as given, show a mean fal 
of 1-075 in.: while those of twelve places on or near the Atlan 
tic border, from Savannah to Newfoundland, show a mean fall of 
peace saecee may serve to illustrate the continued —- of cyclones - 
a Toaeeatone of the American Philosophical Society, vol. vii, New Series P 
